= Martin Kreitman
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<Evolutionary biologist> who, with <John H. McDonald>, developed a comparison of within-<species> variation and between-<species> divergence to test <neutral evolution>. Their 1991 study compared synonymous and <amino acid>-changing differences at the <alcohol>-dehydrogenase locus in <Drosophila>, finding an excess of fixed <amino acid> changes consistent with <natural selection>.<Adaptive protein evolution at the Adh locus in Drosophila by John H. McDonald and Martin Kreitman>[Abstract]{ref}
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